Alert archive / Wisconsin / Tornado Warnings in 1991

Tornado Warning 10, NWS Green Bay, WI

July 7, 1991Iowa County, Sauk County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 7, 1991, 2:26 PM CDT for Iowa County, Sauk County, Wisconsin. It was in force for 34 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 7, 1991, 2:26 PM CDT (19:26 UTC)
Expired
Jul 7, 1991, 3:00 PM CDT
In force
34 min
Issued by
NWS Green Bay, WI
Area
Whole counties

Counties Iowa County, WI, Sauk County, WI

What was reported inside it

TimeReportWhereRemark
Jul 7, 2:26 PM CDTThunderstorm Wind 0Iowa, WI
Jul 7, 2:30 PM CDTThunderstorm Wind 0Iowa, WI
Jul 7, 2:41 PM CDTThunderstorm Wind 0Sauk, WI

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.4 hours before the alert went out and 210 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 1991-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 1991-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1805 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KMSN 071925
TORMSN
WIC049-111-072000-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MADISON WI
226 PM CDT SUN JUL 7 1991
 
THE NATIONAL WEATHER SERVICE IN MADISON HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  300 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL WISCONSIN
 
   ...NORTHERN IOWA COUNTY...SOUTHERN SAUK COUNTY
 
RADAR INDICATED A POSSIBLE TORNADO ABOUT 5 MILES SOUTH OF LONE ROCK
MOVING EAST AT 50 MPH.
 
CITIES INVOLVED ARE ARENA....LONE ROCK...AND MAZOMANIE.
 
 
DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO.  CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS.  IF YOU ARE CAUGHT IN THE PATH OF
A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDeING.  IF NO
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT.
STIMACH

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 7, 1:45 PM CDTSevere Thunderstorm WarningGRBIowa, Richland60 min
Jul 7, 1:56 PM CDTSevere Thunderstorm WarningGRBColumbia, Dane, Sauk64 min
Jul 7, 2:12 PM CDTSevere Thunderstorm WarningGRBAdams, Juneau48 min
Jul 7, 2:41 PM CDTTornado WarningGRBColumbia, Dane34 min
Jul 7, 2:59 PM CDTTornado WarningGRBDane31 min
Jul 7, 3:07 PM CDTTornado WarningGRBDane33 min

Nearby

Tornado Warnings in Wisconsin, 1991Every tornado warning in 1991Tornadoes in 1991

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.